Product Overview​

The ESP32-S3-CAN-2CH is an industrial-grade Wi-Fi wireless communicator based on the ESP32-S3 main controller, supporting peripheral interfaces such as Wi-Fi, Bluetooth, and CAN. It features built-in power isolation, optocoupler isolation, and other protection circuits, making it safe, stable, and reliable for AIoT applications.

Features​

• Based on ESP32-S3 microcontroller with Xtensa 32-bit LX7 dual-core processor with frequency up to 240MHz
• Integrated 2.4 GHz Wi-Fi and Bluetooth 5 (LE) dual-mode wireless communication with excellent RF performance
• Two onboard isolated CAN interfaces for easy expansion and connection to various CAN devices
• Onboard pin header, allowing access to other devices
• Onboard USB Type-C port for power supply, firmware downloading and debugging, making development more convenient
• Onboard power supply screw terminal, supports 7-36V wide voltage input, suitable for industrial applications
• Onboard RTC clock chip, supports timing tasks
• Onboard digital isolation to avoid external signal interference with the control chip
• Onboard integrated power isolation, providing stable isolation voltage, no extra power supply required for the isolated terminal
• Onboard CAN working indicator lights for easily monitoring the device's operating status
• Rail-mounted protective enclosure, easy to install, safe to use

Specifications​

Onboard Resources​

1. ESP32-S3 Up to 240 MHz, equipped with 2.4 GHz Wi-Fi and Bluetooth LE
2. LED indicators
   • PWR: Power indicator
   • CAN_1: Lights green when data is sent from the CAN_1 interface, lights blue when data is received from the CAN_1 interface
   • CAN_2: Lights green when data is sent from the CAN_2 interface, lights blue when data is received from the CAN_2 interface
3. ESP32 BOOT button
4. ESP32 RESET button
5. Power isolation Provides stable isolation voltage, no additional power supply required on the isolated side
6. CAN_1 matching resistor Reserved 120R matching resistor, can be enabled with jumper cap
7. CAN communication interface Used to connect external CAN devices
8. CAN_2 matching resistor Reserved 120R matching resistor, can be enabled with jumper cap
9. CAN transceiver chip
10. Digital isolation Prevents external signals from interfering with the control chip
11. 16MB Flash
12. IPEX 1 connector The external antenna version connects an external antenna through this connector (routed out via the SMA connector on the enclosure)
13. Onboard ceramic antenna The onboard antenna version uses this onboard antenna
14. RTC battery header For connecting a rechargeable RTC battery (SH1.0)
15. USB Type-C port Can be used for device power supply, firmware download, and USB communication
16. Power supply screw terminal Supports DC 7-36V wide voltage input
17. Pin header (2.0mm pitch) Can connect other functional modules via the pin header
18. DC-DC power module Power module, supports up to 3.3 V 2 A output
19. TVS diode (Transient Voltage Suppressor) Effectively suppresses surge voltage and transient spike voltage in the circuit
20. ME6217C33M5G Low dropout LDO, current (Max) 800 mA
21. CAN transceiver chip
22. DC-DC power chip
23. XL2515QF20 CAN controller
24. RTC chip PCF85063 RTC clock

Interface Introduction​

Dimensions​

This chapter includes the following sections. Please read as needed:

• Arduino Getting Started
• Setting Up the Development Environment
• Example

Arduino Getting Started​

New to Arduino ESP32 development and looking for a quick start? We have prepared a comprehensive Getting Started Tutorial for you.

• Section 0: Getting to Know ESP32
• Section 1: Installing and Configuring Arduino IDE
• Section 2: Arduino Basics
• Section 3: Digital Output/Input
• Section 4: Analog Input
• Section 5: Pulse Width Modulation (PWM)
• Section 6: Serial Communication (UART)
• Section 7: I2C Communication
• Section 8: SPI Communication
• Section 9: Wi-Fi Basics
• Section 10: Web Server
• Section 11: Bluetooth
• Section 12: LVGL GUI Development
• Section 13: Comprehensive Project

Note: This tutorial uses the ESP32-S3-Zero as a reference example, and all hardware code is based on its pinout. Before you start, we recommend checking the pinout of your development board to ensure the pin configuration is correct.

Setting Up the Development Environment​

1. Install and Configure Arduino IDE​

Install the ESP32 Board

• To use ESP32-related boards in Arduino IDE, you must first install the "esp32 by Espressif Systems" board package.
• Follow the board installation requirements for installation. "Online installation" is generally recommended. If online installation fails, use "offline installation".
• For a detailed installation tutorial, see: Arduino Board Management Tutorial

ESP32-S3-CAN-2CH required development board installation description

2. Installing Libraries​

• There are usually two ways to install Arduino libraries: online installation and offline installation. If the library installation requires offline installation, you must use the provided library files. For most libraries, you can easily search for and install them through the Arduino online Library Manager. However, some open-source or custom libraries are not synchronized to the Arduino Library Manager, so they cannot be found through online search. In this case, you can only install these libraries manually offline.
• For a detailed library installation tutorial, see: Arduino Library Manager Tutorial
• The ESP32-S3-CAN-2CH library files are stored in the example program. Click here to go to: ESP32-S3-CAN-2CH Example

Library installation instructions for ESP32-S3-CAN-2CH

Example​

Arduino Project Settings​

ESP32-S3-CAN-2CH Example

01_WIFI_AP​

Example Description

• This example implements CAN interface control over Wi-Fi. This example enables the Wi-Fi AP mode.

Notes

• Can be flashed directly
• The Web page can only be used when connected to the device's Wi-Fi

Web Page Control​

Use a mobile Bluetooth debug assistant to connect to the ESP32-S3-CAN-2CH device, obtain the IP after connecting to Wi-Fi, and open the Web page via the IP.

• Connect to the Wi-Fi of the ESP32-S3-CAN-2CH device. The Wi-Fi name is ESP32-S3-CAN-2CH, and the password is waveshare.

• Check the serial port or use a Bluetooth debug assistant to get the current IP
• Open the Web page to control the CAN interface (after the device is powered on, it takes a short time to configure. The first time the Web page is opened after each power-on may be slow.)

02_WIFI_STA​

Example Description

• This example implements CAN interface control over Wi-Fi. This example enables the Wi-Fi STA mode.

Notes

• Requires modifying the Wi-Fi to connect to
• The Web page only supports controlling the device when it is on the same network as this product. If using a mobile phone for control, mobile data must be turned off.

Web Page Control​

Use a mobile Bluetooth debug assistant to connect to the ESP32-S3-CAN-2CH device, obtain the IP after connecting to Wi-Fi, and open the Web page via the IP.

• Before flashing the program, open MAIN_WIFI_STA/WS_Information.h and change STASSID and STAPSK to the Wi-Fi name and password you want to connect to, respectively. After the device is powered on, it will automatically connect to the configured Wi-Fi.
• Check the serial port or use a Bluetooth debug assistant to get the current IP
• Open the Web page to control the CAN interface (after the device is powered on, it takes a short time to configure. The first time the Web page is opened after each power-on may be slow.)

This chapter includes the following sections. Please read as needed:

• ESP-IDF Getting Started
• Setting Up the ESP-IDF Development Environment
• Example

ESP-IDF Getting Started​

New to ESP32 ESP-IDF development and looking to get started quickly? We have prepared a general Getting Started Tutorial for you.

• Section 1: Environment Setup
• Section 2: Running Examples
• Section 3: Creating a Project
• Section 4: Using Components
• Section 5: Debugging
• Section 6: FreeRTOS
• Section 7: Peripherals
• Section 8: Wi-Fi Programming
• Section 9: BLE Programming

Please Note: This tutorial uses the ESP32-S3-Zero as a teaching example, and all hardware code is based on its pinout. Before you start, it is recommended that you check the pinout of your development board to ensure the pin configuration is correct.

Setting Up the Development Environment​

Install the ESP-IDF Development Environment​

1. Download the installation manager from the ESP-IDF Installation Manager page. This is Espressif's latest cross-platform installer. The following steps demonstrate how to use its offline installation feature.

   Click the Offline Installer tab on the page, then select Windows as the operating system and the ESP-IDF version you need (the version shown in the screenshot is for reference only — choose the version that fits your actual needs).

   
   

   After confirming your selection, click the download button. The browser will automatically download two files: the ESP-IDF Offline Package (.zst) and the ESP-IDF Installer (.exe).

   
   

   Please wait for both files to finish downloading.

2. Once the download is complete, double-click to run the ESP-IDF Installer (eim-gui-windows-x64.exe).

   The installer will automatically detect if the offline package exists in the same directory. Click Install from archive.

   
   

   Next, select the installation path. We recommend using the default path. If you need to customize it, ensure the path does not contain Chinese characters or spaces. Click Start installation to proceed.

   
   

3. When you see the following screen, the ESP-IDF installation is successful.

   
   

4. We recommend installing the drivers as well. Click Finish installation, then select Install driver.

   
   

Install Visual Studio Code and the ESP-IDF Extension​

1. Download and install Visual Studio Code.

2. During installation, it is recommended to check Add "Open with Code" action to Windows Explorer file context menu to facilitate opening project folders quickly.

3. In VS Code, click the Extensions icon  in the Activity Bar on the side (or use the shortcut Ctrl + Shift + X) to open the Extensions view.

4. Enter ESP-IDF in the search box, locate the ESP-IDF extension, and click Install.

   
   

5. For ESP-IDF extension versions ≥ 2.0, the extension will automatically detect and recognize the ESP-IDF environment installed in the previous steps, requiring no manual configuration.

Example​

01_WIFI_AP​

Example Description

• This example implements CAN interface control over Wi-Fi. This example enables the Wi-Fi AP mode.

Notes

• Can be flashed directly
• The Web page can only be used when connected to the device's Wi-Fi

Web Page Control​

Use a mobile Bluetooth debug assistant to connect to the ESP32-S3-CAN-2CH device, obtain the IP after connecting to Wi-Fi, and open the Web page via the IP.

• Connect to the Wi-Fi of the ESP32-S3-CAN-2CH device. The Wi-Fi name is ESP32-S3-CAN-2CH, and the password is waveshare.

• Check the serial port or use a Bluetooth debug assistant to get the current IP
• Open the Web page to control the CAN interface (after the device is powered on, it takes a short time to configure. The first time the Web page is opened after each power-on may be slow.)

02_WIFI_STA​

Example Description

• This example implements CAN interface control over Wi-Fi. This example enables the Wi-Fi STA mode.

Notes

• Requires modifying the Wi-Fi to connect to
• The Web page only supports controlling the device when it is on the same network as this product. If using a mobile phone for control, mobile data must be turned off.

Web Page Control​

Use a mobile Bluetooth debug assistant to connect to the ESP32-S3-CAN-2CH device, obtain the IP after connecting to Wi-Fi, and open the Web page via the IP.

• Before flashing the program, open components/esp_bsp/bsp_common.h and change WS_STA_SSID and WS_STA_PASS to the Wi-Fi name and password you want to connect to, respectively. The device will automatically connect to the configured Wi-Fi after power-on.
• Check the serial port or use a Bluetooth debug assistant to get the current IP
• Open the Web page to control the CAN interface (after the device is powered on, it takes a short time to configure. The first time the Web page is opened after each power-on may be slow.)

This product provides test firmware that can be flashed directly to verify whether the onboard devices are functioning properly.

• Firmware download: ESP32-S3-CAN-2CH Example. The bin file is located in the firmware directory.
• Flash address: 0x00

1. Example​

• ESP32-S3-CAN-2CH Example

2. Hardware Resources​

• ESP32-S3-CAN-2CH Schematic

3. Technical Manuals​

• ESP32-S3 Chip Official Manuals
  • ESP32-S3 Chip Datasheet
  • ESP32-S3 Chip Technical Reference Manual

4. Software Tools​

• Arduino IDE Official Download Link

• ESP32_Arduino offline packages

• VS Code Official Website

• Thonny Official Download Link

• Debugging Tools

  • Flash_download_tool
  • SSCOM
  • Bluetooth debugging tool (nRF Connect)

5. Other Resources​

• ESP32-Arduino Official Documentation

Support

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Email: services01@spotpear.com